According to an entry in the Clan Cameron Archives, Loch Arkaig, west of the Great Glen, has a "lake-horse" that in the past was seen by a deer stalker and his children.

BBC: Monsters Inc: Scottish lochs and their creatures

Mr Cameron denied his campaign to solve the so-called "West Lothian" question - where Scottish MPs can vote on issues which affect only England like health, law and order and education but not vice versa - was pandering to a "little Englander" agenda.

BBC: NEWS | UK | UK Politics | Cameron makes pledge on Scotland

In a speech in Oxfordshire, Mr Cameron described the disorder that spread from London to parts of the East and West Midlands, Merseyside, Bristol, Manchester and Gloucester as "a wake-up call for our country".

BBC: England riots: Broken society is top priority - Cameron

Mr Cameron, who faces regular questioning by the committee, was also asked about the West Coast Main Line fiasco, which he described as "personally very frustrating".

BBC: David Cameron: Lessons to learn on horsemeat scandal

David Cameron told MPs earlier in the Commons that courts in London, Manchester and the West Midlands would sit through the night for "as long as is necessary", to deal with the high number of people arrested for rioting in England.

BBC: England

West African bloc Ecowas has authorised the immediate deployment of 2, 000 troops to Mali and UK Prime Minister David Cameron said British forces would offer logistical assistance to help transport troops and equipment.

BBC: Hollande steps up France security over Mali and Somalia